<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>Cache Editor for DataGrid - jQuery EasyUI Demo</title>
	<link rel="stylesheet" type="text/css" href="../../themes/default/easyui.css">
	<link rel="stylesheet" type="text/css" href="../../themes/icon.css">
	<link rel="stylesheet" type="text/css" href="../demo.css">
	<script type="text/javascript" src="../../jquery.min.js"></script>
	<script type="text/javascript" src="../../jquery.easyui.min.js"></script>
</head>
<body>
<h2>Cache Editor for DataGrid</h2>
<p>This example shows how to cache the editors for datagrid to improve the editing speed.</p>
<div style="margin:20px 0;"></div>

<table id="dg" class="easyui-datagrid" title="Cache Editor for DataGrid" style="width:700px;height:auto"
       data-options="
				iconCls: 'icon-edit',
				singleSelect: true,
				toolbar: '#tb',
				url: 'datagrid_data1.json',
				method: 'get',
				onClickRow: onClickRow
			">
	<thead>
	<tr>
		<th data-options="field:'itemid',width:80">Item ID</th>
		<th data-options="field:'productid',width:100,
						formatter:function(value,row){
							return row.productname;
						},
						editor:{
							type:'combobox',
							options:{
								valueField:'productid',
								textField:'productname',
								method:'get',
								url:'products.json',
								required:true
							}
						}">Product
		</th>
		<th data-options="field:'listprice',width:80,align:'right',editor:{type:'numberbox',options:{precision:2}}">List
			Price
		</th>
		<th data-options="field:'unitcost',width:80,align:'right',editor:{type:'numberbox',options:{precision:2}}">Unit
			Cost
		</th>
		<th data-options="field:'attr1',width:250,editor:'text'">Attribute</th>
		<th data-options="field:'status',width:60,align:'center',editor:{type:'checkbox',options:{on:'P',off:''}}">
			Status
		</th>
	</tr>
	</thead>
</table>

<div id="tb" style="height:auto">
	<a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-save',plain:true"
	   onclick="accept()">Accept</a>
	<a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-undo',plain:true"
	   onclick="reject()">Reject</a>
	<a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-search',plain:true"
	   onclick="getChanges()">GetChanges</a>
</div>

<script type="text/javascript">
	(function ($) {
		function getCacheContainer(t) {
			var view = $(t).closest('div.datagrid-view');
			var c = view.children('div.datagrid-editor-cache');
			if (!c.length) {
				c = $('<div class="datagrid-editor-cache" style="position:absolute;display:none"></div>').appendTo(view);
			}
			return c;
		}

		function getCacheEditor(t, field) {
			var c = getCacheContainer(t);
			return c.children('div.datagrid-editor-cache-' + field);
		}

		function setCacheEditor(t, field, editor) {
			var c = getCacheContainer(t);
			c.children('div.datagrid-editor-cache-' + field).remove();
			var e = $('<div class="datagrid-editor-cache-' + field + '"></div>').appendTo(c);
			e.append(editor);
		}

		var editors = $.fn.datagrid.defaults.editors;
		for (var editor in editors) {
			var opts = editors[editor];
			(function () {
				var init = opts.init;
				opts.init = function (container, options) {
					var field = $(container).closest('td[field]').attr('field');
					var ed = getCacheEditor(container, field);
					if (ed.length) {
						ed.appendTo(container);
						return ed.find('.datagrid-editable-input');
					} else {
						return init(container, options);
					}
				}
			})();
			(function () {
				var destroy = opts.destroy;
				opts.destroy = function (target) {
					if ($(target).hasClass('datagrid-editable-input')) {
						var field = $(target).closest('td[field]').attr('field');
						setCacheEditor(target, field, $(target).parent().children());
					} else if (destroy) {
						destroy(target);
					}
				}
			})();
		}
	})(jQuery);
</script>
<script type="text/javascript">
	var editIndex = undefined;

	function endEditing() {
		if (editIndex == undefined) {
			return true
		}
		if ($('#dg').datagrid('validateRow', editIndex)) {
			var ed = $('#dg').datagrid('getEditor', {index: editIndex, field: 'productid'});
			var productname = $(ed.target).combobox('getText');
			$('#dg').datagrid('getRows')[editIndex]['productname'] = productname;
			$('#dg').datagrid('endEdit', editIndex);
			editIndex = undefined;
			return true;
		} else {
			return false;
		}
	}

	function onClickRow(index) {
		if (editIndex != index) {
			if (endEditing()) {
				$('#dg').datagrid('selectRow', index)
					.datagrid('beginEdit', index);
				editIndex = index;
			} else {
				$('#dg').datagrid('selectRow', editIndex);
			}
		}
	}

	function accept() {
		if (endEditing()) {
			$('#dg').datagrid('acceptChanges');
		}
	}

	function reject() {
		$('#dg').datagrid('rejectChanges');
		editIndex = undefined;
	}

	function getChanges() {
		var rows = $('#dg').datagrid('getChanges');
		alert(rows.length + ' rows are changed!');
	}
</script>
</body>
</html>